#pragma once

#include <iostream>
#include <string>
#include <fstream>

//该类是工具类
class Util
{
public:
    static bool ReadFileContent(const std::string& filename,std::string* out)
    {
        //version 1
        // std::ifstream in(filename);
        // if(!in.is_open())
        // {
        //     return false;
        // }
        // std::string line;
        // while(std::getline(in,line))
        // {
        //     *out += line;
        // }
        // in.close();
        // return true;

        //version 2:以二进制的形式进行读取
        int filesize = FileSize(filename);
        if(filesize > 0)
        {
            std::ifstream in(filename);
            if(!in.is_open())
                return false;
            out->resize(filesize);
            in.read((char*)(out->c_str()),filesize);
            in.close();
        }
        else
            return false;

        return true;
    }

    static bool ReadOneLine(std::string& bigstr,std::string* out,const std::string& sep)
    {
        auto pos = bigstr.find(sep);
        if(pos == std::string::npos)
            return false;
        *out += bigstr.substr(0,pos);
        bigstr.erase(0,pos + sep.size());
        return true;
    }

    static int FileSize(const std::string& filename)
    {
        std::ifstream in(filename,std::ios::binary);
        if(!in.is_open())
            return -1;

        in.seekg(0,in.end);
        int filesize = in.tellg();
        in.seekg(0,in.beg);
        in.close();
        return filesize;
    }
};